Dunderberg Spiral Railway/Bald Mountain Loop

Harriman-Bear Mountain State Parks

Along T-T Trail on route of railway - Dunderberg Spiral Railway/Bald Mountain Loop - Harriman-Bear Mountain State Parks - Photo: Daniel Chazin Along T-T Trail on route of railway - Dunderberg Spiral Railway/Bald Mountain Loop - Harriman-Bear Mountain State Parks - Photo: Daniel Chazin

This loop hike follows portions of the never-completed Dunderberg Spiral Railway, climbs to the summit of Bald Mountain, and passes several expansive viewpoints over the Hudson River.

41.281193, -73.962922

From the parking area, walk south on Route 9W for a few hundred feet. Just beyond road signs for Routes 9W and 202, you'll see three blue blazes and three red-dot-on-white blazes on a tree adjacent to the road. These blazes mark the start of the Timp-Torne (blue) and Ramapo-Dunderberg (red-dot-on-white) trails. You'll be following the Timp-Torne...

Prepare For Your Hike

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Trip Reports

rate experience
August 29, 2017
Wonderful Hike
I walked this hike yesterday by myself and didn't see another soul. Peaceful, challenging, perfect. Reading the description of the trail on this site really added to the pleasure as I am not a great map reader...people who have hiked with me will call that an understatement. But I am getting better. My husband was very good at mapping out hikes and we spent many days hiking in Harriman. He passed away 2 years ago and this was my first time back. I left some of his ashes at the trail head and at the suggested lunch spot looking toward Bear Mountain. Know that your joy in spending time on the trails in that special state of mind either alone or with other hikers would be a great delight for him. I was happy all day.
Sheila F.
August 21, 2015
Try the Hike in Reverse
I went up the RD this morning,as it is more exposed to the sun, and came back on the TT, which had more shade and less ups and downs.  I also extended the hike to the Timp, making a 10 mile loop. I started at 10:00, reached Bald Mt just after 11:00 and reached the Timp for lunch at 12:15. I was back at my car at 2:15 and drank about 2 quarts of water.  I didn't hike fast, but steady with almost no stops. I found the downs hard on my knees,even though I used trekking poles, but I am 62.  I had some breeze today and rain cooled things down overnight, otherwise I would start earlier in the summer.  Dunderberg had fires 20 years ago and the RD was much more exposed some years back, but the new growth provided shade most of the time.
July 20, 2015
nice hike, mind the snakes.
Wow was it hot today, but this hike was worth it! The path just challenging enough and the views were spectacular. I took the trail backwards, Ramapo-Dudenberg to 77 to Timp-Torne, and I noticed going up the Ramapo side first that finding red and white markers could be very challenging and I often had to backtrack to make sure I was still on trail. Also, there were a couple of larger fallen trees blocking the path between Dudenberg and Bald Mountain, forcing a new alternate path to be slowly formed in the high grass. I only point this out out of concern because as I was descending from Bald Mountain, I almost staggered upon a very large Timber Rattesnake that was hanging out right next to the  path in the leaves, high grass and brush. He was very kind to let me know that he was there with a vigourous shaking of his rattler and was also nice enough to forgive my foul language as he did take me by surprise. 
viva la vinegaroon
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